Confessions of a Murder Suspect by James Patterson and Maxine Paetro
Malcolm and Maud are poisoned in their bedroom. The only suspects are their four children. Even our narrator, Tandi, isn't sure if she is the murderer or not. These children have remarkable powers. What is really in those vitamins they take every day? This is a delightful mystery that begs you to read the next in the series ASAP.